Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679b92c4671cb161064ecaf8eb51ba71413e82226112ceebae451ad7cd97a69b' 
  AND token = '0gQOWuPDeSOCRyJAJ0+ZRmmI2XQfyXSTTuwsGuv99Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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