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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '060d15da9861a2c66bcecb556b35d8ca438e014156dc02d8a77cd88b05303be5' 
  AND token = 'aRSBLUvfHHMU0mfy6tkFLqOH2UiP+GkB/se+tgIgH9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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