Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76051c8e53b8cbc41ce23a2abfe87e8a9e32cff1b827a09379a13155e8f00a0b' 
  AND token = 'F88uLxjRKc8d9XYswguoOYx98GjbJ1+WtYWhlQDgX1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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