Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12ed7a0c0f2395fb8557cb0fac6dc74ee60b07042f99b0da6b6acf8f7ce0803' 
  AND token = 'BtqqCc8o+W8WnQdSJ0dJ45ox4o5vMb+CqG6AQyLM+Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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