Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cc9889447387ba329cdf8dab440e9a3efb74a62788ae60dffe0948490ebbda' 
  AND token = '7xk92qCQez9GvA0z0G/FKNECuvOVclgJG1lr90vK+rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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