Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e903c5c451ad8a31590e69e91a1f9b76829e1019e91606f8cdf73af4c303ed3' 
  AND token = 'n0kTxdRO247+eBwlBK1EBfezIUxCwl0E3BZ+I+/KWpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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