Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9893a291984c3b82231ee3c2c04f2eaf6d71a1ccbbdec03dd9ff98518b182d' 
  AND token = 'FNBTWxH5ki429m6YMrUeKTAQuiKXeRzlD6a1o0PeZYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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