Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7b04bc8589d15acd468eaeac552a286134b53975020f06765a57c569021d6a' 
  AND token = 'b2/0UKTIZMkep7iaZvVHUPW7whtza6tlD16H7Qb+U1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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