Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56390a1013634e9ad7d9604b58a268a7f4d0d0d65be8d46ead8844a9655762f9' 
  AND token = 'v7zVP4L2p5mKf44KZuTmf+c/EAwEF7kzAcpWty9uuC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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