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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2dc6cdea7e9a1bdf2b7bd56a9373580956b47671df1420fd0f92b152455eb6e5' 
  AND token = 'bKJMxkQjswWe8Iciu3snHOL/qPqlaNG8cxDnWDSIlWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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