Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2577718611b6d0993b63eb512bd7b08e1fdee9ddd3cbc44a008d59aa338831f9' 
  AND token = 'ukuT1Oam4IRo9gD0ZZlSUUaY+MB4xD+gCmb0QaJCggo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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