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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd45f9068a3626d18ea8fc173b8c4343eff63a3dea87f6c4084017f515ddd9ddf' 
  AND token = 'X0C4fppweatDVWOsijr+ltG4ob9Kjywym8NjQDv7jqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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