Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6846024b4279e45dcb10c651cc77f2a8a0df4cb546f39ee66cd72e24de7db0b' 
  AND token = 'AlitwjlG7G3a1JeRZgZ1Ci2wdFpzoF6M9iTAYyntVLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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