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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20a018050b6632b83dc93d7637755af4e7ad5f08561482fb1c3912553becaac3' 
  AND token = 'afidyj27591Uq81M3r+I/WZSgU2rM8MHBfcOa1Uo0xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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