Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d3dfb4b71bd7f44a3e5a7d359735506904273dbbbea055d3eb02020e5d284c' 
  AND token = 'PlZDhchjdnOGUZXoWhJi3dXwjDL9lwA0GOTVkW5nAFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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