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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bee367b96d3dd4980c04db3ebf5ca6c77eb86792e91dba632e2d73cc441c6846' 
  AND token = 'JnKKz2pzyT7RSHJsJp0eXuQtZ4+GRBjzRhyV0U9+36s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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