Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f9e0a2bef1136a6651dad825321658de0d40829ca0d7b2c2feefbcb36e6321' 
  AND token = '4Q5Hqn9qmWwRHckZlfEOmsBiw3c0oC1OXelTIsIljyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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