Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8351e66a61e0c01decb434465058c93c350c20d37c1cb2b2d84eadd41452e706' 
  AND token = 'OGv2PAP0zlKzLyeVcTb8/R4ok4qGxfdYndU4leTaUc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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