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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f70091c91672dfeab9d908c3f9b92927e77e10f03766e76172b696adce178ca' 
  AND token = 'ncaJSv9+4XfDJyLZOv+aVjWw6xvO9kntuUjOFxiAUfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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