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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75999b0452d7829c66bcfb6ba1ddbb5e79d849f8566796a16f23da91b30dfe2b' 
  AND token = 'UgDZeOSbd6mpDyezP8Srz8iSydLuUTielnq0eGCEJww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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