Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490e6b3c8f3decf0ec076d1da7a3102c277141c2dd0fbe5f31e7b497bd257f68' 
  AND token = 'M1t4RmYPfrXHlRgH2U0cpI6WuuZFrqM5UmNNlgO4F7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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