Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39ae0edc36b38df64d7bc10dbe95444ecaccc09cec9fd1b1061ebe5f2510fbf' 
  AND token = 'XSORtdbUq7tgB+HReMwuQvvnIlnLVIjUQNflR2JiUM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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