Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50fa8ee9c964e04a91f3bfc0b8326cc7a8a8125715d6e68069ce2ae07194d0f2' 
  AND token = 'GhEXdLLjWiJCoZRyayevmV9cTj9pKiQC5Lj04Mm7ydU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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