Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c54007bc3cc5bfcb884b2777a567198db1421031229ed98b95c3a844b0d4b3' 
  AND token = 'q1QVmmQ+sskJVilTWU3WvTV17XzlcVJGYCpY4s7RAwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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