Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e3acb41dcc3cf8c5f217e5d4dba8ca3f365bdc269970a9327951e31470d0e3' 
  AND token = 'A8zDJeFq0anSVHVYarNHzss+9+LEcLz7JiRE6eRIwrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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