Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d278b63f4ef717d691b114c4d9723bb65d6d575134b8d534b6ab96aaa21c41' 
  AND token = 'kFIC5baDNfdMVM2xMd+2hGouOriRaR/s+BHrvl62yyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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