Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e6bef50a75e9ce5d64493c7ab4878b0f8af1a790fc569b04582a316c1ff586' 
  AND token = 'g6imxBBiTvIKIHyDm9TqhKMVawY4WeeACfD1Z/DaDoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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