Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81dce3cca4f818dfc5910ef2488f24276d72c82f0fb9f66cbfd9e965f65e9bb9' 
  AND token = 'DXNINgBZk2OV3tbvVFAKT8EqRDoWwzcid36KBJaF7B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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