Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3712bfc76b6324a22a5e77786d63996dc31b04306b5ebabbe537eb04fe5f3cc' 
  AND token = 'yn8KFz6etpf7gBoS9mg0j6ke855izqT4xFu6IA2D1Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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