Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddde3857f7aee96c054b9921fcd6bb136b0f7b8250f02b05e34cef0362b6348e' 
  AND token = '6o+w+/l91dFJKHs2wTSe77zI6bIT7CJn5bIVUU40m/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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