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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bdab62af809ec8b7916fb680a9b3dad39e959914b8853197e7d7586974dd4e7f' 
  AND token = 'mY5UOKzhCMnIcaJ8iN0/NDGf7u4Cy4NtSSoTUIu+O24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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