Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28097c8a3de3cd7307b1f6c2cf62f425babd672fb6ac625e769dd598142bc896' 
  AND token = 'Mdpy2Vhbay2AKB7CQUHPvwfd2pMyBWo0kxHKw3Ewae4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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