Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54890964513d588269cc225ab019eab8850e0b5c69e9375bd4c62dab6ba2c2dd' 
  AND token = 'ubBfXUnt6dJcDfv1aLOwvMoOYbYZdPysKRFRA/c4avU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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