Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90e9d2e098278a2346ee24ff4fc17d1067766b1c05086dbd9b337179ae06a68' 
  AND token = 'dmvb+S4GH5vFqvIkSBtPPZ8OwbUxRQIKBvpYlraS0i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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