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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1eb0d61e821ab56e8f0dac4598d99fcb7c35698fbbfee8a2419232a22bbd327e' 
  AND token = 'yn+2YuKlRgMQnzPcKldPuv4FJR2PHNjaRAY9mIZFx4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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