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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ccd507f632dc176667edabea436826b4b5f5966e5a68315ed00b67961cab1f9' 
  AND token = '77K9iq/uVopAGU7HII9K4omoVc5CalmHqN4de/H2MH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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