Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd6900b5384db4c78e22c3a73e50fc24370b62e02c949cfe21f55e55743c126' 
  AND token = 'r/5dEqO0ObSG8A8ylEAQ/rj9VKnZg1gEaHWtYvpP300=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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