Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca9ca8db6c6f611ce62580726f8c0d7492d7cbaa1d9b0108041efb2483d890b' 
  AND token = 'U9rZCdrg3yTgSq5/RQ4rdOXQGRF4OGvM3yl5sQCe/Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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