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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f81bfd5ba0a25493b68b43ab8fca3f40c3db258e2fa52891e872938d30bc5075' 
  AND token = 'jwO5qCK86nBrHzbfuRDeAP0nZJan3O/9i6cY5BPicqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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