Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c275b704352e10e6caaa15e1e57a792b9f8bb5bb55f9c75df64576f62db218a' 
  AND token = 'Vprylx9KDx5yBkm7ywKkoOtlMu+Hehs+yuJcEFnUu4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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