Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7c60e080b2b48332f8e3f274c3fab85ad85722cf2d9b5c50446dbb0b5e06a0' 
  AND token = 'FMzk0bfyjPBgW8eA5NmZ4bqny1smvsnBsV4og6+YJbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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