Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d79825f348148023bede6a77d05b4a0b1dfe70e108148afbec67430c0701ca4' 
  AND token = '1IVO28ARuAeH9F71KXrOMTBdN3I5eB9IWWWdehEM684=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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