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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9132eda0b636756df75391774d17f112b767c90a46d1a1101a83b72d495d7eac' 
  AND token = 'eIiv4B+Sty2s80vZ06MyBkgT00oUjtzBq1dWSycWvF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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