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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f9065fb7d63e7025233e7888a416337731f61d9627005466a17d98e3bcc2c7fb' 
  AND token = 'bC5bUKOyFk58skdlM7ew/ARV8iZe2PMAM1nG/n/PFH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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