Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8b263ffedb17f2132879610bafc7182017f7cb5fd8a95742125e73431d9f8a' 
  AND token = '5UpeYY1xd8Av+zBp/aSHdLSY2+46WUJ1yuoavBlxdUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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