Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc78bf70e7b1e262fd8cf8127a5b7112296dc207bd0535127f7d3a2b6001ac0' 
  AND token = 'YkMLuLLc4M2MGUvOaqWsh35GRY7SX3HmT9uGWowConU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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