Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0388084e210a1ad13fc1775546836ec32ca9779ac2dd6342cda6d83f428c4f7d' 
  AND token = 'VeywFRfCfsJ1dE1ObEBPoSOKiWqBqXTCDtI4QBKHAxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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