Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d111f03f1613440ca26bee26e18a359a9cc2d4f231dba44add3825fac36740' 
  AND token = 'NP64c/rw8pPm+kURBsfNSwEM/EonxTZvfZYrSRGvAp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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