Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a139557dcafa6abf765ae2c4ef1f5f43bd00729d859c1fba674229b189c48c' 
  AND token = 'DYiOFbiQ8xC6/ZuF49Jtdzbi6Sx5+Y6kLsrumE3CXR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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