Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ff00d187f9ca1eb77bc087c9001d8415eb492fb74c1a6cee9772acaa8a2eff' 
  AND token = 'qBAoa9apMVGTnd+bR68NM84544eFErUrMu634GlVTn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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