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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58ab7514cf82450823cd1d0d91931d7252ebf389093250528731dcc72bbd1ef5' 
  AND token = 'hD1rK1i5zB3XxQXuzskHzOUgVdZI019ATl/wA7Re9u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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