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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab87cdee4042a6e97dc886f33335faf1b5b35acacd704ed32e6799625eb8bf0a' 
  AND token = 'YE/OEyY+nYuUnD+qmMxTdds1Ho/ADtMeDoBWNftJXHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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