Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c5a5340520d830bfd6c3e88012309401b98d05b199d3a44c992be37b27cae1' 
  AND token = '0GQH/K94tmpZcmMTZIj+3nKzgx49Kbrk4fgpDkx6rhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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