Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d29abb172fc16ef8ca3932ca74afb81a8892d1fffecdc67ddd7b6a0f8b7f58' 
  AND token = 'OW1AY3/eGHPGzIg7t9iaDbIPKDickPODWwy/y48VtJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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