Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f53a81d66674479f31f8bad68945ed9ed15b0de76b157068aca645a4cc6097' 
  AND token = '82wNkl8rkNEzJP4XAO9yQsRgB29z3w0UNFMIIduCMWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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