Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a2d31b5a86ee378ed6302a979a81ed58e49e439e51f2f6ffafc77f0c632212' 
  AND token = 'tkhv/DEJsIlNvnWQEku2lBOnPeOGXOUj1L+Tx6qnaVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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