Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3bf53610e33c801691398502d884bab32aab2d3b0e8aa9c0f13bcd3e30ee59' 
  AND token = 'r0SgcA5qE94uah5LTqB2la9nN0ozGLKfNjn2iUCVN6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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