Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c862147c174b44a3717fb185680b8d5099fecb7e0ea4a9c578e0d637889ac39' 
  AND token = 'RDDP8l4ovL4FV8leZzWPv9IpFKMwYkLP6nC70/UlPOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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