Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e69ec937b001840e259229a3b86cb99aaf33f03d90e1c5bb2f265c554b774f9' 
  AND token = 'iFYo+Lkb59OQvTQGJ7XnDUr6FSa8ZHrO5kF6ZYlVI7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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