Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c33e7fd95e810d4cae4b04eb308f462fb37ca95873543023e2991f453b1d86' 
  AND token = 'd7evMnSaLHnZ0erfF6+kfetm3+IH2JMUKjI4BMrqfQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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