Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9cac0ad78f2149fcb74397945f8196e5ce4c83d4a6adc09e92357d84a0bcbb' 
  AND token = 'PBaIoq+pYu2Tk6Iu5dqxCVh+yyoARy4vTrO3AmplI0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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