Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71ce50fa288578386f5ca4f83c21a8b00854328e89f07ed96249425d0cc4090' 
  AND token = 'JaiUe9juJuOQ6Kh8IpRotVgG96i8x21mm/lAKozNmPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}