Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66759ef1199513961640bad7443efab256e2e5c4b339150f22099be610dcc484' 
  AND token = 'QpTeszXrSOLvXCkOh1YJ/sFWhWGLdMgOj815UjUg2Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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