Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621a680139c34bcb0d655387db10c09634134788be8d3d1e122066be4f3a619b' 
  AND token = 'o3/NVoopecsV5V1fok4Brij6LUkAKfB4geXa5FO/pGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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