Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81992665e2aa1a384fb8d4810891c93bf9b2c655c3ced569f0609f99e2d21bd0' 
  AND token = 'NCImCGVeypj3pvHiY4uR04ABDKcg9k4ALMv3G41jI+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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