Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3032bc8f71d256c1fb19459211acea558330bea3c69556d11fec0a65653794' 
  AND token = 'rNUlIIBLGTFQ2gdR58ehuLiBjlVXUrXhf+cDIHEtAhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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