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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a583b5ab2e946a48f455b765a39c2acb86556c8b99515b3b2ca24a7d63a5b65' 
  AND token = '88waunut4TCA5gAuN+gTO8m7cYGx++IchZHsZIq7yvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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