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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7d4e170e00574c409ce346442f7721208cf7e5a662e969f80cafe8dd13fb4765' 
  AND token = 'JiuwclDmu54f9lqDn//MCFOCPdhC9wubAbjPUuoMnKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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