Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1db6b61e59420268fd5a8559623de3c2c265143dca228cbc13f67cac798c80b' 
  AND token = 'mEHPkS1yY7z10ht6nYi96I0diDs02CcIvhecwh53G4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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