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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5edf4f908d8eb410b4b2d47192157ff21ab43a425afcc3a9dcf3df4b00a7495b' 
  AND token = 'gPMHuxKrzq+bcKk3r88VR53/VvIeFu9e3iUN22pDUf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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