Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188738b14198ade0a5ff2067f1c66610b6fde0d9e35eb25099d6972305d7b09d' 
  AND token = 'xYfuXE9qey3lMO892skfllG4BWzIsFC8sU+N8mRhvjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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