Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d55945d66d4ef96fc0740008dc976256f1ba554540ea3ea608a98eb0b716a6' 
  AND token = 'T1F87sruHaQ+mRrVlcGHC1nV+Cw1nUcGFTvDylCEHNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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