Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a998fc18c29d18885c3c05ba215ba7071bf401521c1736e947066dfbde1baed8' 
  AND token = '/IxdFrimXLldFPZnZ0uz2DORqigQm3S79Olfu5aIspY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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